Looks like magnesium (the yellowing between the veins) and early calcium (the brownish spots) deficiency. We've had great success with treating this with an epsom salt foliar spray in combination with including a cal-mag supplement in our feeding schedule. When foliar feeding with epsom salts, you only need about a teaspoon per gallon of water. We usually use a half teaspoon per gallon of water. pH around 7 and of course, foliar feed at lights-out. You should see results in as little as a few days or a week. Make sure you use plain epsom salt and not the scented types. 😊✌️